So this is how Charlize Theron gets her fantastic figure -- pushing a baby stroller up Runyon Canyon!

On Friday the Oscar winner and her nanny were snapped sweating it out during a hike, and we can't get over how adorable little Jackson is! Charlize adopted the tiny tot a little over a year ago, and she recently told E! News that she was thinking about having more children. “I don’t know. I mean, if all my kids could be like Jackson, I’d have 10 more right now,” she said.